Protective case with over-center flap closure

ABSTRACT

There is provided a case ( 1 ) for a device ( 22 ) comprising a sleeve portion ( 4 ) having a sleeve opening ( 17 ), a closure portion ( 6 ), and a hinge ( 8 ) connecting the closure portion ( 6 ) to the sleeve portion ( 4 ) adjacent the sleeve opening ( 17 ). The hinge ( 8 ) is adapted to allow the closure portion ( 6 ) to move from a first position away from the sleeve opening to allow the device ( 22 ) to be inserted into the sleeve portion ( 4 ) and a second position where the closure portion ( 6 ) is positionable over an end of the device ( 22 ). Movement of the hinge ( 8 ) from the first position to the second position causes the closure portion ( 6 ) to pass over an end of the device ( 22 ) to form an over-center engagement with the end of the device ( 22 ).

FIELD OF THE INVENTION

The present invention relates to a protective case for a mobile device formed from a sleeve and a hinged closure that protects the device from impact and that securely maintains the device within the sleeve. More particularly, the present invention relates to a protective case with a hinged closure that fits over an end of a device within the case.

It is noted that citation or identification of any document in this application is not an admission that such document is available as prior art to the present invention.

Cases for mobile devices have been designed to provide at least some protection from impact events, such as when the device is dropped, hit, or otherwise struck. One type of case, referred to as a sleeve, is designed to fit over personal devices such as laptop computers and electronic tablets. The device is slipped into an opening at an end of the sleeve. A lid closes the opening of the sleeve. The lid typically comprises a simple flap that covers the opening to the sleeve. An engagement element, such as a magnetic latch, may hold the lid closed against a further portion of the sleeve (or device) or the end of the flap may simply be tucked into the sleeve between the device and sleeve to maintain the device within the sleeve. The addition of such engagement elements to the sleeve increases the complexity of manufacturing the sleeve, adds to cost, and increase the weight of the sleeve. Magnetic latches can also impact the performance of a device, such as damaging hard drives and accidentally activating sleep/wake functions. A flap arrangement on its own is generally not as secure and may easily open, and tucking the flap in may be difficult and inconvenient in use.

It is therefore desirable to provide an improved case for a device which addresses the above described problems and/or which more generally offers improvements or an alternative to existing arrangements. In particular, but not exclusively it is desirable to provide a new sleeve-type case for an electronic device that securely maintains the device within the case without the need for engagement elements, that provides improved impact protection, and that allows the user to easily remove the device from the sleeve when desired.

It is noted that in this disclosure, and particularly in the claims, terms such as “comprises”, “comprised”, “comprising” and the like can have the meaning attributed to it in U.S. Patent law; that is, they can mean “includes”, “included”, “including”, and the like; and that terms such as “consisting essentially of” and “consists essentially of” have the meaning ascribed to them in U.S. Patent law, that is, they allow for elements not explicitly recited, but exclude elements that are found in the prior art or that affect a basic or novel characteristic of the invention.

It is further noted that the invention does not intend to encompass within the scope of the invention any previously disclosed product, process of making the product or method of using the product, which meets the written description and enablement requirements of the USPTO (35 U.S.C. 112), such that applicant(s) reserve the right to disclaim, and hereby disclose a disclaimer of, any previously described product, method of making the product, or process of using the product.

SUMMARY OF THE INVENTION

The present invention relates to a protective case with a hinged closure that fits over an end of a device within the case where the closure is held closed by an over-center interference between the device and the closure and with an impact absorbing bumper arranged on an interior perimeter of the case. According to the present invention there is therefore provided a case as described in the accompanying claims.

In an embodiment of the invention there is provided a case for a device comprising a sleeve portion having a sleeve opening, a closure portion, and a hinge connecting the closure portion to the sleeve portion adjacent the sleeve opening. The hinge is adapted to allow the closure to move from a first position away from the sleeve opening to allow the device to be inserted into the sleeve portion and a second position where the closure portion is positionable over an end of the device. Movement of the hinge from the first position to the second position causes the closure portion to pass over an end of the device to form an over-center engagement with the end of the device.

In another embodiment of the invention such a case is provided with a bumper arranged along a portion of an inner peripheral side of the sleeve portion and/or the closure portion. The bumper may have a plurality of protrusions that contact an edge of the device. These protrusions may have a shape that attenuates mechanical impact communicated to the device such as a triangular or pyramidal shape. The bumper may extend along the entire inner periphery of the sleeve and closure. The bumper may be formed from one or more of an injection molded foam, die cut foam, compression molded foam, injection molded rubber, co-molded rubber, and hard plastic.

According to a further embodiment of the invention, such a case includes latching components to removeably connect the closure portion to the sleeve portion when the hinge is in the second position. The latching components may include a magnetic latch, a snap, a buckle, and/or hook-and-loop panels.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of a case 1 according to an embodiment of the invention;

FIG. 2 shows another perspective view of a case according to the embodiment of the invention shown in FIG. 1;

FIGS. 3a-3d show cross sectional views of the case according to the embodiment shown in FIG. 1;

FIG. 4 shows a further cross sectional view of the case according to the embodiment shown in FIG. 1 illustrating the geometric relationship between the components;

FIG. 5a shows a front perspective view of a further embodiment of the invention;

FIG. 5b shows a rear perspective view of the embodiment shown in FIG. 5 a;

FIG. 5c shows a side perspective view of the embodiment shown in FIG. 5 a;

FIG. 6 shows a perspective view of the interior of another embodiment of the invention;

FIG. 7 shows a front perspective view of yet another embodiment of the invention;

FIG. 8a shows a front perspective view of a further embodiment of the invention;

FIG. 8b shows a rear perspective view of the embodiment shown in FIG. 8a ; and

FIG. 8c shows a detailed side perspective view of the embodiment shown in FIG. 8 a.

DETAILED DESCRIPTION OF EMBODIMENTS

It is to be understood that the figures and descriptions of the present invention have been simplified to illustrate elements that are relevant for a clear understanding of the present invention, while eliminating, for purposes of clarity, many other elements that are conventional in this art. Those of ordinary skill in the art will recognize that other elements are desirable for implementing the present invention. However, because such elements are well known in the art, and because they do not facilitate a better understanding of the present invention, a discussion of such elements is not provided herein.

The present invention will now be described in detail on the basis of exemplary embodiments. It is noted that any numerical ranges disclosed herein are included to individually disclose every sub-range and number, both whole integer and partial fraction, within the disclosed range. For example, a disclosed range of 1-100 is intended to individually disclose 20-90, 40-80, 30.5-50.2, 20, 67.3, 84.512924, and every other range and number that falls within the recited range.

FIG. 1 shows a sleeve-type case according to an embodiment of the invention. The case 1 includes a sleeve portion 4 and a closure portion 6 connected by a hinge 8. The closure portion is moveable with respect to the sleeve portion 4 about the axis 7 of the hinge 8. The closure portion 6 includes a front closure panel 16 and a rear closure member 14. The sleeve portion 4 is formed by a front sleeve panel 5 and a rear sleeve member 10. The hinge 8 connects the closure portion 6 along one edge of the rear closure member 14 with the sleeve 4 along one edge of the rear sleeve member 10 adjacent to the opening 17 of the sleeve 4, as shown in FIG. 2. The front closure panel 16 is longer than rear closure member 14, creating a closure engagement 17. When the case is closed, as will be explained below, closure engagement 17 is adjacent the front sleeve panel 5 at sleeve engagement 19.

FIG. 2 shows another view of the case of FIG. 1, with the closure portion 6 rotated about the axis of hinge 8 away from the sleeve portion 4. The front sleeve panel 5 and the rear sleeve member 10 form a first cavity 18 and sleeve opening 17. The front closure panel 16 and the rear closure member 14 form a second cavity 20 with a closure opening 21. When the case is closed the first cavity 18 and second cavity 20 form an enclosure sized and shaped to hold a device, such as a laptop computer, an electronic tablet, a cell phone, and the like.

FIGS. 1 and 2 show a preferred embodiment wherein the axis 7 of hinge 8 traverses the shorter dimension of the rectangular case, wherein the device is inserted lengthwise into the case, and wherein the closure portion 6 fits over a short edge of the device. According to another embodiment, the axis of the hinge traverses the longer dimension of the rectangular case. According to this embodiment, the device is inserted width-wise into the case and the closure portion fits over a long edge of the device.

FIG. 3a shows a cross section of the case 1 of FIG. 1 with an electronic device 22 inserted into the first cavity 18 of the sleeve portion 4. The length L of the electronic device is greater than the distance D from the hinge 8 to the bottom interior end of the first cavity 18 in the longitudinal direction so that, when the device 22 in inserted, a portion of the device protrudes from the first cavity by a distance L minus D. The closure portion 6 is shown rotated about the axis of hinge 8 so that the inside surface of the front closure panel 16 contacts the protruding end of the device. The closure portion 6 is at an angle A with respect to the sleeve 4. The distance T is the thickness dimension of the second cavity 20.

The bottom interior end of the first cavity 18 includes a bumper 24, as will be discussed below. According to one aspect of the invention, the bumper 24 is formed from a resilient material. Increasing angle A by rotating the closure 6 about the hinge 8 causes the point where the inside of the front closure panel 16 contacts the device 22 to move closer to the bottom end of the first cavity 18. This applies a force along the longitudinal axis of the device 22, causing the device to press against the resilient bumper 24 and be displaced into the first cavity. According to another embodiment, one or more of the rear sleeve member 10, the rear closure member 14, front closure panel 16, and the hinge 8 stretch resiliently as the closure portion 6 is rotated in the direction of increasing angle A, thus stretching the sleeve portion 4 and closure portion 6 over the device 22. According to a further embodiment, both a resilient bumper and a resiliently stretchable portion of the case are provided.

FIG. 3b shows another cross sectional view of the case with the closure portion rotated about hinge 8 with the front closure panel 16 positioned against the edge of the device 22 with the closure portion 6 centered over the protruding end of the device 22. According to one embodiment, angle A is 90 degrees and the point of contact between the engagement portion and the device is at its shortest distance from the bottom of the first cavity. At this position, the force applied to the device by the engagement portion is maximum and the resilient elements (e.g., bumper 24) are at their greatest deformation. With the closure portion in this position, the point of contact between the device 22 and the bottom of the first cavity is D+T. If the length of the device L is greater than or equal to D+T, the bumper 24 must compress or the case must stretch as angle A increase in order to reach the position shown in FIG. 3b . Thus,

L>=D+T

or

L−D>=T.

FIG. 3c shows another cross sectional view showing the closure portion 6 rotated about the hinge 8 so that angle A is greater than 90 degrees. The end of the device 22 is positioned partially within second cavity 20 formed by the closure portion 6. In this position, because the closure portion 6 is rotated past the position where it is centered over the end of the device, the distance between the bottom of the first cavity and the point of contact between the closure portion 6 and the bottom interior end of the first cavity 18 increases with increasing angle A. As a result, the force applied by the engagement portion on the device decreases and the resilient element 24 and/or the stretched elements of the closure portion, sleeve portion and/or hinge rebound. Because the closure portion 6 has been rotated “over-center,” this rebound forces the closure portion 6 to continue rotating about hinge 8 until the closure portion 6 moves into the fully closed position, illustrated in cross section shown in FIG. 3d . An end of the device 22 extends into the second cavity 20, securing the device within the case. According to a further embodiment, in the fully closed position, closure engagement 17 is pressed against sleeve engagement 19, further securing the device 22 within the case.

According to another embodiment, an engagement mechanism such a pair of ferromagnetic elements, hook-and-loop attachment panels, or an arrangement of snaps or buckles may additionally be provided on the closure engagement 17 and sleeve engagement 19, respectively, to provide increased securement of the closure portion when the case is in the closed position.

The geometric relationship between the case 1 and the device 22 is illustrated in FIG. 4. The first and second cavities 18, 20 are designed to conform to the dimensions of the device. As discussed above with respect to FIG. 3a , when the device 22 is inserted in the first cavity 18, it protrudes by a distance L−D before longitudinal force is applied to compress the bumper 24 or stretch the case. In the position shown in FIG. 4, this is the protrusion distance P. The distance from the axis of rotation of hinge 8 to the inside surface of the front closure panel 16 is the thickness dimension of the second cavity T. A right triangle is formed by the lengths T and P. The relation among these distances and the angle A is:

T=P*sin(A).

Thus, in the position shown in FIG. 4 where the distance the device protrudes from the first cavity P is:

P=T/sin(A)

As angle A increases from 0 degrees to 90 degrees, sin(A) increases and the protrusion distance P decreases. When A is 90 degrees, as shown for example in FIG. 3b , the distance P is at a minimum since sin(90 degrees) is at its maximum (i.e., 1) and thus P=T. Provided the distance the device protrudes from the first cavity L−D when there is no deformation of resilient elements (e.g., no compression of bumper 24) is greater than or equal to T, the device 22 is forced into the first cavity 18 against the resilient elements. As the hinge 8 rotates past 90 degrees sin(A) decreases, P increases, and the end of the device 22 is pushed into the second cavity by the rebounding of the bumper 24 and/or the return of the stretched sleeve portion, closure portion, and/or hinge to their relaxed length. This creates an over-center engagement between the case 1 and the device 22.

As shown in FIG. 3d , the second cavity 20 formed by the closure portion 6 fits over the protruding end of the device 22. According to one embodiment, the depth of the second cavity 20 is less than or equal to the distance L−D so that the end of the device is held against a bumper 25 on the inside surface of the second cavity 20.

According to one embodiment, the dimensions of the case are selected so that the distance the device extends from the first cavity, L−D is greater than the thickness dimension T of the second cavity. According to a further embodiment, a more secure engagement of the closure portion is created by increasing the distance L−D relative to T. The force required to move the closure over the protruding end of the device, however, increases as the distance L−D increases relative to T. In order to effect the movement of the closure over the end of the device, according to one embodiment, the protruding end of the device is a smaller portion of the length of the device in the longitudinal direction, while a larger portion of the length of the device resides within the first cavity.

Dimensions L−D and T are selected to provide a sufficiently secure engagement between the device and the closure portion to maintain the device within the case while allowing the user to conveniently open and close the case. According to a preferred embodiment, T is between about 1 mm and 30 mm when L−D ranges from T to about 40 mm. More preferably T is between about 1 and 15 mm and L−D is between about 20 mm and 30 mm. Most preferably, T is about 7 mm and L−D is about 25 mm.

FIGS. 5a and 5b show front and rear perspective views, respectively, of another embodiment of the invention. FIG. 5c is a side perspective view. Case 60 is formed from a sleeve portion 64 and closure portion 66. As shown in FIG. 5a , the sleeve portion 64 includes a front sleeve panel 70 affixed to a sleeve perimeter portion 68. As shown in FIG. 5b , the sleeve portion 64 includes a rear sleeve panel 72 also affixed to the sleeve perimeter portion 68. The front sleeve panel 70, rear sleeve panel 72, and sleeve perimeter portion 68 form a cavity, such as the first cavity 18 discussed above with respect to FIGS. 1-4. The closure portion 66 is formed by a front closure panel 76 affixed along the edge of a closure perimeter portion 78 as shown in FIG. 5a . A rear closure panel 80 is likewise affixed to the perimeter of the closure perimeter portion 78 as shown in FIG. 5b . A hinge 82 connects the rear closure panel 80 and the rear sleeve panel 72. When the case is in a closed configuration, as shown in FIGS. 5a, 5b, and 5c , the sleeve perimeter portion 68 and closure perimeter portion 78 abut one another at either end of the hinge 82. According to the embodiment shown in FIGS. 5a and 5b , the perimeter portions 68, 78 are formed from a single piece of material with slits 69, 71 at either end of hinge 8. The material forming the perimeter position is sufficiently flexible that when hinge is rotated, the part of the perimeter portion adjacent to slits 69, 71 bends to allow the hinge to open. As shown in FIG. 5a , the front closure panel 76 includes an engagement portion 84. When the closure 66 is rotated about the hinge 82 to the closed position, the engagement portion 84 is adjacent the front sleeve panel 70.

According to one embodiment, the rear closure panel 80 and rear sleeve panel 72 are formed from a single piece of material, with hinge 82 formed as a flexible region between the sleeve 64 and the closure 66. According to another embodiment, the hinge is formed by a thinner region of the single piece of the material forming the rear closure panel and rear sleeve panel. According another embodiment, the rear closure panel and rear sleeve panel are formed independently and connected to one another by a separate hinge.

As shown in FIG. 5b , the rear sleeve panel 72 and rear closure panel 80 are thicker than the region adjoining the hinge 8 thus forming a gap on either side of the hinge. This arrangement allows the closure portion to rotate about the axis of hinge 82 so that the thicker portions of the panels 72, 80 do not interfere with one another.

According to one embodiment, the panels forming the sleeve portion and closure portion are made from a compliant material that allows the case to conform to the shape of the device. This material can be fabric, molded elastomer, rubber, silicone, or a foam such as neoprene, EVA, or SBR. According to a preferred embodiment, the panels are formed from a urethane foam covered by a flexible material such as a Lycra fabric. According to another preferred embodiment, the material covering the outside surfaces of the panels is a wear resistant material, such as Cordura™ nylon. According to another preferred embodiment the material covering the inside surfaces of the panels is a soft material such as microfiber that reduces scratching of the surface of an inserted device. According to another embodiment, the panels are formed from a rigid or semi-rigid material such as metal, hard polymer, a composite, and the like. According to a further embodiment, the materials forming the panels and the perimeter portions may be formed from a water resistant or waterproof material.

The perimeter portions 68, 78 may be formed from the same or from different materials as the panels 70, 76, 72, 80. According to one embodiment, the perimeter portions are formed from a resilient material that protects the edges of the device from impact. According to a preferred embodiment, the perimeter portions are formed from a molded polyurethane foam.

The panels may be connected to the perimeter portions by a variety of means including by sewing, welding, adhesive bonding, or by co-molding or over-molding. Where panels are formed from water resistant or waterproof materials, the panels may be joined to the perimeter portions by means that form a water resistant or waterproof joint, such as by welding, adhesive bonding, co-molding, or over-molding.

FIG. 6 shows a portion of a case according to a further embodiment of the invention, such as the one shown in FIGS. 5a-5c , with the front sleeve panel 70 and front closure panel 66 removed to show the interior of the case. A bumper 90 is disposed along the inner perimeter. Bumper 90 made be formed from a variety of resilient materials to provide impact protection for the device including injection molded foams, die cut foams, compression molded foams, injection molded elastomers, rubber, silicone, co-molded rubber and hard plastic components, and combinations thereof. The bumper 90 may be formed from the same material that forms the perimeter portions 68, 78 discussed with respect to FIGS. 5a, 5b, and 5c or may be a separate component affixed to an inner perimeter of perimeter portions 68, 78.

The bumper may include protrusions 92 that extend inward. According to one embodiment, these protrusions are shaped to enhance impact protection. As shown in FIG. 6, the protrusions are triangular, with an apex that contact the edge of the device. Other shaped protrusions could also be used, including rounded, square, or rectangular shapes.

FIG. 7 shows a further embodiment of the invention. In addition to the over-center engagement of the closure portion with the device, the embodiment shown in FIG. 7 includes latching components 96 disposed on the overlapping surfaces of the closure 76 and front sleeve panel 70. According to one embodiment the latching components are a pair of ferromagnetic strips disposed on facing portions of the front sleeve panel 70 and front closure panel 76. According to another embodiment, the latching components are patches of hook-and-loop material disposed on facing portions of the front sleeve panel 70 and front closure panel 76. When the case is in the closed position, engagement of the ferromagnetic strips or hook-and-loop material patches hold the respective panels together. This latching mechanism provides additional securing force to hold the case closed and also functions to keep the case closed when no device is inserted. The latching components could also be an arrangement of snaps or buckles to mechanically attach the front sleeve panel 70 and front closure panel 76 to one another.

FIGS. 8a, 8b, and 8c show front perspective, rear perspective, and detailed side perspective views of a further embodiment of the invention. The case 100 is formed from a perimeter portion 102 made from a resiliently deformable material such as molded polyurethane foam connected with a front sleeve panel 104, rear sleeve panel 106, front closure panel 108, and rear closure panel 110. A hinge 114 connects the rear sleeve panel 106 with rear closure panel 110. Through holes 112 are provided in the perimeter portion 102 proximal to either end of the hinge 114. The case is opened by moving the rear closure panel relative to the rear sleeve panel 110, causing the hinge 114 to flex. Through holes 112 allow the perimeter portion 102 to bend in response to flexing of the hinge 114. According to one aspect of the invention, the through holes partially or fully collapse as the hinge 114 is flexed. According to another aspect of the invention, the through holes 112 allow the perimeter portion 102 to more easily stretch in the area of the hinge when the hinge 114 is flexed.

Flexing the hinge 114 exposes the cavity formed by the front and rear sleeve panels 104, 106. A device is inserted into this cavity with a portion of the device protruding from the sleeve as discussed with respect to the previous embodiments. The hinge 114 and through holes 112 are positioned so that an over-center engagement is formed between the front and rear closure portions 108, 110 and the device.

While this invention has been described in conjunction with the specific embodiments outlined above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, the preferred embodiments of the invention as set forth above are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit and scope of the inventions as defined in the following claims. 

1. A case for a device comprising: a sleeve portion having a sleeve opening; a closure portion; and a hinge connecting the closure portion to the sleeve portion adjacent the sleeve opening, the hinge adapted to allow the closure to move from a first position away from the sleeve opening to allow the device to be inserted into the sleeve portion and a second position where the closure portion is positionable over an end of the device; wherein movement of the hinge from the first position to the second position causes the closure portion to pass over an end of the device to form an over-center engagement with the end of the device.
 2. The case of claim 1, wherein the sleeve portion forms a cavity, wherein the device comprises a major portion inserted in the cavity of the sleeve portion and a minor portion including the end of the device extending from the cavity when the case is in the first position, and wherein when the hinge is moved from the first position to the second position, the case resiliently deforms to allow the closure portion to pass over the minor portion of the device.
 3. The case of claim 2, wherein the closure portion forms a closure cavity and when the case is in the second position, the minor portion of the device is within the closure cavity.
 4. The case of one of claims 1-3, further comprising a bumper arranged along a portion of an inner peripheral side of the sleeve and/or the closure.
 5. The case of claim 4, wherein the bumper is compressed in a longitudinal direction when the closure is moved from the first position to the second position.
 6. The case of one of claims 1-5, wherein when one or more of the sleeve portion, the closure portion, and the hinge is adapted to stretch in a longitudinal direction when the closure is moved from the first position to the second position.
 7. The case of one of claims 1-6, wherein the closure portion further comprises an engagement surface and wherein the engagement surface contacts a surface of the sleeve portion when the case in the second position.
 8. The case of one of claims 1-7, wherein the sleeve is formed from a front panel joined to a rear panel by a peripheral edge.
 9. The case of claim 8, wherein the front panel and the rear panel comprise a compliant material.
 10. The case of claim 8, wherein the front panel and rear panel comprise a rigid material.
 11. The case of one of claims 1-10, wherein the sleeve portion and closure portion comprise water resistant materials.
 12. The case of one of claims 1-11, wherein the device has a longitudinal dimension L, the sleeve portion has a depth D, the closure portion forms a closure cavity with an internal dimension equal to T, and wherein L−D is greater than or equal to T.
 13. The case of claim 12, wherein L−D is greater than T.
 14. The case of one of claims 1-13, wherein the closure portion is formed by a front closure panel and rear closure panel connected to a peripheral portion at a first region of the peripheral portion, wherein the sleeve portion is formed by a front sleeve panel and rear sleeve panel connected with the peripheral portion at a second region of the peripheral portion, and wherein the hinge has an axis located between the first and second regions of the peripheral portion.
 15. The case of claim 14, further comprising a pair of slits formed in the peripheral portion between the first and second regions, one slit at each end of the hinge along the axis of the hinge.
 16. The case of claim 14, further comprising a pair of through holes formed in the peripheral portion between the first and second regions, one through hole at each end of the hinge along the axis of the hinge.
 17. The case of one of claims 14-16, wherein one or more of the rear sleeve panel and the rear closure panel are thicker than the hinge.
 18. The case of claim 1, wherein the sleeve portion comprises a rear sleeve member and a front sleeve panel connected along respective portions of their perimeter edges to form the sleeve opening and a sleeve cavity, wherein the closure portion comprises a rear closure member and a front closure panel connected along respective portions of their perimeter edges to form a closure opening and a closure cavity, and wherein the hinge connects the rear sleeve member to the rear closure member along respective edges of the sleeve opening and closure opening.
 19. The case of claim 18, wherein the first closure panel is longer in a longitudinal direction than the rear closure member and wherein, when the hinge is in the second position a portion of the front closure panel overlaps a portion of the front sleeve panel.
 20. The case of claim 18 or 19, wherein a contiguous rear panel forms the rear surfaces of the rear sleeve member and rear closure member and wherein the hinge is formed by a flexible hinge line of the contiguous rear panel. 